Photo: Icelandic Volcano Begins Erupting Again

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Photo: Icelandic Volcano Begins Erupting Again

Iceland's Eyjafjallajökull volcano began erupting again earlier this week. This image, captured May 6 by the European Space Agency's Envisat satellite, clearly shows the grayish brown ash of the plume blowing east.

The eruption is the latest in a string that began March 20 and that grounded flights in many parts of Europe for a week. How big a problem the ash clouds become depends not just on the size of the eruption, but on the direction of the wind.